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OpenAI API
A paid web service from OpenAI: a program sends text, images, or audio to OpenAI's AI models and receives the generated answer, billed by the amount processed.
Price: Pay per use: from US$0.10 per million input tokens and US$0.50 per million output tokens for gpt-6-luna; gpt-6.1-sol costs US$2.00 and US$10.00 (read 13 October 2026)
Free plan: no
openai.com/api
Who uses it, and for what
One row per story. The grade is for the claim that the business uses this tool, not for its revenue.
| Story | What it does there | When | Cost stated | Grade | Source |
|---|---|---|---|---|---|
| Cal AI | One of two rented model providers that estimate calories from the food photo; the company did not train a model. image-reading model, not named | B | A public page outside the story's source list | ||
| Jenni AI | Generates the text that the editor suggests; the product resells this model output. GPT-3 | since 2020 | US$20,000 to US$30,000 a month (September 2023) | B | Sacra, 26 April 2024: Jenni AI: the $5M/year Chegg of generative AI, and the interview with David Park published the same day |
| NightCafe | One of the outside image-model providers that NightCafe calls through an API and sells by the credit. DALL-E 2 in 2024; GPT Image 2 on the 2026 home page | B | TechCrunch, 31 August 2024: Before Midjourney, there was NightCafe, and it's still kicking | ||
| Postiz | Model provider behind the AI generation features of the product; also required for video clipping. | B | GitHub repository gitroomhq/postiz-app, metadata read 12 October 2026 | ||
| Umax | The face analysis is a prompt to OpenAI's vision model, so the founder trained no model of his own. GPT Vision | B | Fortune, 1 July 2024, by Alexandra Sternlicht: Inside the 'looksmaxxing' economy | ||
| Screenshot to Code | GPT models read the screenshot and write the code; the first version also used DALL-E for images. GPT-4 Vision and DALL-E at launch, later GPT-4 Turbo and GPT-4o, in 2026 GPT-5.5 and GPT-5.4 Mini | since November 2023 | B | Screenshot to Code README on GitHub, October 2026 | |
| DimeADozen | Answered hundreds of pre-written prompts whose answers were joined into each report. ChatGPT models; the 2023 sources do not name the model | B | CNBC Make It, Megan Sauer, 16 October 2023: Two friends used AI and $185 to start a side hustle, they just sold it for $150,000 | ||
| Wrestle AI | Runs the AI inference that turns each uploaded video into a score and written coaching feedback. | B | Rork blog, 25 February 2026: 18yo Made $131K in 6 Months with Rork | ||
| Base44 | Small, cheap model that the router sends patches and small fixes to. GPT-4o-mini | C | AI & No-Code Exits newsletter, 16 January 2026: How Maor Shlomo sold Base44 for $80M | ||
| Chatbase | The model behind the first product, chat with your own documents; still one of the model families that agents can run on. GPT-3 at the start | C | Indie Hackers, 2023, interview by Channing Allen: How a college student reached $64,000/mo in 6 months by being an AI first mover | ||
| Magnific | Wrote about half of the product's source code, according to the founder's email to users in May 2024. GPT-4, used to write code | C | The Decoder, May 2024: Magnific AI co-founder predicts the rise of one-person unicorns propelled by AI after exit | ||
| TypingMind | The first model interface the app was built on; customers connect their own API key and pay OpenAI for usage. ChatGPT API at the March 2023 launch | since March 2023 | C | Indie Hackers, 2023: How a tool that improves the UI for ChatGPT reached $10k/mo only a few months after launch | |
| Formula Bot | The model that turns the typed instruction into a spreadsheet formula; the founder never trained a model. GPT-3 in 2022 | since 2022 | about US$5,000 in the first two weeks, before any revenue | C | Bubble customer story, 23 April 2025: How Formula Bot Built a 1 Million-User AI Tool on Bubble |
| PDF.ai | The language model that answers the questions from the text of the uploaded PDF. | C | SaaS Starter Stack: PDF.ai founder interview | ||
| Tweet Hunter | First language model, used to analyse and sort viral tweets and for early tweet generation. GPT-3 | replaced by AI21 Studio | C | AI21 Labs, 20 February 2023: How Tweet Hunter scaled to an 8-figure exit with AI21's LLM | |
| AudioPen | Whisper turns the recording into a transcript and a GPT model rewrites it into a clean note; the founder's largest cost. Whisper (speech to text) and GPT-4 (rewriting) | C | AI Makers newsletter, 16 May 2023: 500 paying customers in 1 month | ||
| Podsqueeze | Writes the show notes and other texts from the episode transcript; the product was built when this API appeared. ChatGPT API | since 2023 | C | SaaStrappers, 17 March 2024: From podcasting to a tool for podcasters, Tiago Ferreira | |
| SiteGPT | The language model that composes the chatbot answers from the customer's website text. GPT-4.1 and GPT-4.1 mini on the 2026 pricing page | C | Starter Story, 8 October 2023: How my AI side project grew to $15K MRR in just a few months | ||
| Rytr | The language model that writes the text; Rytr formats the request before the call and cleans the answer after it. GPT-3 | C | Starter Story, 28 November 2021: I Built A Simple AI Writing Tool That Makes $60K/Year | ||
| Talknotes | Turns each voice recording into text and rewrites it in the chosen style; the main running cost of the app. Whisper for transcription; a second model call rewrites the transcript | under US$10 in total to build the first version | C | Starter Story, 4 April 2024: I Taught Myself To Code And Now Make $5K/Mo | |
| Arcads | Default image model inside the product; the founder's growth agents also send prompts to ChatGPT. GPT Image 2 (default image model) | C | A public page outside the story's source list | ||
| AutoShorts.ai | AI model service named by the founder; a language model writes the script of each video. model not named | US$4,242.27 in one month (cost table posted 5 September 2024) | C | X replies by Eric Smith, 16 and 17 May 2024: growth channels, costs and technology | |
| DocsBot AI | Language models that write the chatbot's answers from the passages found in the customer's documents. ChatGPT API at the launch; GPT-5.1 to GPT-6.1 added by October 2026 | since March 2023 | C | Aaron Edwards on X, 9 March 2023: announcement of the DocsBot beta, and six other posts of 2023 | |
| Magai | GPT models called through a direct API account, which the founder says has the highest usage tier. GPT-4 at the launch; GPT-5 by October 2025 | since April 2023 | C | Magai home page in the Wayback Machine, 8 April 2023 | |
| Headlime | Text model that writes the marketing copy; the founder got early access by emailing OpenAI's chief technology officer. GPT-3 | since June 2020 | C | Indie Hackers, 1 July 2021: Danny Postma, Zero to 7 Figure Exit in 8 Months with Headlime, AMA | |
| Softgen | Coding model that the agent can use to write the apps; the user chooses the model. Listed by the current owner. GPT-5; the site names GPT-5.4 in October 2026 | C | Softgen overview page by the current owner: The Original Full-Stack AI Builder | ||
| My AskAI | Models write the answers, the handover summaries and the insights; embedding models index the customer's content for search. GPT-4o; embedding models | C | Grow Your B2B SaaS podcast, 11 June 2024: S4E7, How MyAskAI bootstrapped with a team of 2 to $300k ARR, with Michael Heap | ||
| BoltAI | First model provider the app was built for; each customer's own key pays for the usage. customer's own API key | C | Daniel Nguyen's newsletter, 29 September 2024: Sep 2024: Interview on Indie Hackers | ||
| Revid.ai | Video model for clips of 4, 8 or 12 seconds, at 130 credits per 5 seconds. Sora 2 | C | Revid AI Credit Costs: Complete Reference, last updated October 2026 | ||
| Castmagic | Language model that writes the show notes, newsletters and threads from the transcript. GPT-3.5 Turbo | since March 2023 | C | Blaine Bolus on X, 9 March 2023: upgrades pushed to Castmagic this week; also his posts of 15 March and 14 November 2023 | |
| CreativeClaw | Named by the company as one of the providers of its generation models. | C | CreativeClaw home page, read 13 October 2026 | ||
| SEObot | One of three model APIs that write the articles; the founder switches between them as each improves. | about US$30,000 a month for all model APIs together (founder, November 2025) | C | Starter Story podcast, 11 November 2025: I Make $250K/Month From 20 Apps, transcript on StationLM | |
| MagicSlides | Language models that write the slides; the first provider of the add-on. GPT models; GPT Image 2 on the 2026 pricing page | US$1,000 (founder, June 2024; period not named) | C | Sanskar Tiwari on X, posts from 2023 to 2026 | |
| LocalRank | Writes the articles of the LLM Citations product, each more than 1,000 words. GPT-4o | C | LocalRank product page: LLM Citations | ||
| Polsia | Generates the video and image adverts of invented people that the advertising agent uploads to Meta. Sora 2 video model for the adverts; image generation | C | Mixergy, 27 May 2026, interview by Andrew Warner: Polsia: AI Agent + Zero Employees = $10M Run Rate | ||
| Nichesss | Writes every text the app produces, from examples of good copy plus the user's form answers. GPT-3 for all text; DALL-E 2 images added to the deal by December 2022 | since November 2020 | US$2,000 a month for AI generation (interview published January 2022) | C | Starter Story, 14 January 2022: This Self-Taught Programmer Built A $360K/Year GPT-3 App |
| Coachvox AI | The core AI engine behind every clone; the company adds its own logic and workflows on top. | C | Coachvox AI: FAQs page, read 14 October 2026 | ||
| aiCarousels | Writes the slide text of each carousel from the user's topic, text, web page or video. GPT-4o from May 2024 | since 2023 | C | Starter Story, 28 November 2023: I Accidentally Built A SaaS in 10 Days & Quit My 9-5, interview with Fernando Pessagno | |
| LLM Gateway | One of the providers to which the gateway routes requests. | C | LLM Gateway: About page | ||
| fastwrite.io | One of the language model providers for text suggestions and the AI advisor, chosen by function and availability. | C | fastwrite.io Datenschutzerklärung (privacy policy), version of September 2026 | ||
| AI Toolbox | Writes the summaries for the two features that condense one chat the user picks. | C | AI Toolbox Privacy Policy, last updated 1 October 2026 | ||
| Koe | Listed among the AI model providers for frames, videos, audio and assistant answers; the model is not named. | C | Koe Privacy Policy | ||
| Pet Plus Us | Generates the portraits from the customer's photos and the chosen look, and screens uploads for harmful content. model not named | C | Pet Plus Us privacy page, last updated 27 September 2026 | ||
| AppAlchemy | Supplies language models for the generation; the founder's tech stack lists it without naming a model. | C | TrustMRR, AppAlchemy markdown profile, read 14 October 2026 | ||
| FounderPal | Writes the marketing strategies from long prompts; the founders chose GPT-4 although cheaper models existed. GPT-4 | about US$1 per strategy | C | Starter Story, 19 March 2024: We Made $60,000 From A Product We Built In 3 Weeks | |
| Questgen and Supermeme.ai | Supplies the language model behind Supermeme's meme captions; the Questgen site also named GPT-3 in January 2022. GPT-3 | since January 2022 | C | Wayback Machine capture of supermeme.ai, 27 January 2022 | |
| Topical Map AI | Language models that produce the keyword ideas and recommendations in each topical map. | C | Pete McPherson, projects page, read 14 October 2026 | ||
| Adspirer | Listed as a model provider in the founder's technology list; no source says which model or for which feature. | C | TrustMRR: Adspirer profile, read 15 October 2026 | ||
| 1ClickWebsite.ai | Runs site creation, Lead Gen and the Website Agent on the Unlimited plan, with the customer's own OpenAI key. model not named | C | 1ClickWebsite.ai Unlimited plan page | ||
| Notis | Runs the assistant's language models, voice transcription and deep research. GPT-5.6 Sol and GPT-5.6 Luna (July 2026); gpt-transcribe for voice (August 2026) | about US$50,000 to August 2026 | C | Notis changelog, August 2025 to August 2026 | |
| SuperbulletAI | GPT-4.1 was one of the two premium models integrated in June 2025, by the roadmap. GPT-4.1 | since June 2025 | C | SuperbulletAI pricing, downloads, roadmap and FAQ pages, read 15 October 2026 | |
| ThreadMaster | Writes the threads from the user's topic or draft. GPT-3.5-turbo on the launch page; the terms of October 2026 say OpenAI's GPT technology | C | Wayback Machine: threadmaster.ai on 15 August 2025 | ||
| Sleek | Listed by the founders in the product's tech stack; the model and its task are not stated. | C | TrustMRR: Sleek, Stripe-verified revenue and sale listing | ||
| Setter AI | Supplies the language model that writes the messages to leads and books meetings. Model not named; Product Hunt calls the product ChatGPT powered | C | TrustMRR: Setter AI LLC, verified revenue profile | ||
| Chat Thing | Wrote the bots' answers from the launch; by June 2023 the bots had used nearly 1 billion OpenAI tokens. gpt-3.5-turbo-0125 as the default model in March 2024; speech-to-text and text-to-speech for voice in 2026 | C | Chat Thing changelog, 20 March 2024: More tokens for everyone | ||
| RankAI | Listed in the backend of the founder-written tech stack; no source names a model. | C | TrustMRR markdown profile of RankAI, revenue verified from Stripe, last synced 30 July 2026 | ||
| AudioNotes | Whisper transcribes recordings, and OpenAI's models power the summaries and the other AI features. Whisper | C | AudioNotes: Plans and Pricing, read 16 October 2026 | ||
| CopyGenius | Writes the text for every template and for the Genius Editor, according to the company's terms page. GPT-3 | C | CopyGenius Terms & Conditions, last updated 18 January 2022 | ||
| Wave AI | Writes the summaries and other language features; in 2024 it also did the transcription. Whisper for transcription in 2024; models for summaries | about US$0.10 per hour of audio for transcription, 2024 | C | Wave Data Processing Addendum, Annex 3: subprocessors and vendors | |
| StoryShort | Named on the July 2024 home page (GPT-4o); in October 2026 the FAQ lists OpenAI among the three voice providers. GPT-4o; voice models | C | Internet Archive copy of storyshort.ai, 27 July 2024 | ||
| AI2SQL | Generated the SQL in the early product; the 2022 site footer says it was powered by OpenAI Codex and GPT-3. Codex and GPT-3 | C | Wayback Machine: ai2sql.io on 27 February 2022 | ||
| Alvas.ai | The model that an agency case study names as writing the text of the AI-generated abandoned-cart emails. GPT-4 | C | Alvas.ai case study, published 27 August 2024: Ackermann x Shaping New Tomorrow, the first ever AI generated Abandoned Cart email | ||
| Sheets Resume | Language models behind the AI resume builder, listed first in the founder's tech stack. | C | Starter Story, 21 March 2025: We Built A $20K/Month AI Resume App | ||
| MakeLanding | The founder tested GPT before building the generator, whose AI writes the page copy; no source names the exact model. GPT | since April 2023 | C | The Fastlane Forum, 29 November 2023: I sold my AI tool for $35,000 (Reddit Post), a copy of the founder's post on Reddit r/Entrepreneur | |
| Letterly | Named in the privacy policy of January 2026 as an AI provider that processes the users' input and output. | C | Letterly privacy policy, last updated 1 January 2026 | ||
| GlowUp | Listed as GlowUp's AI provider on the founder's website; no source names the model that applies the makeup. | C | Louis-David Paul-Hus's website: home page and Digital Products page | ||
| Pingo AI | Provides AI models that receive chat messages and voice recordings to generate the tutor's replies; the policy does not name the models. | C | Pingo AI privacy policy, last updated 11 August 2026 | ||
| Draft AI | Turns the user's voice recordings into text before the posts are written; the audio files are deleted after processing. Whisper | C | Draft privacy policy, last updated 24 July 2026 | ||
| Brawler | Named by the seller as the AI provider; the app uses AI for video analysis, coach chats and food logging. | C | whatsthe.app listing: Strikr, read 16 October 2026 |
Grade A: the tool's maker or a payment processor confirms the use. Grade B: an independent report, or the tool is visible in public code. Grade C: the founder or the company says so.
Used in the same businesses
Other tools in the stories above, with the number of stories that share both.
Other tools for the same job
AI models, with the number of stories that use each.