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Study developer tools through the first useful integration, usage limits and the cost of running the service.
Which repeated engineering job becomes a paid service?
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| # | Project | Category / model | Reported revenue | Evidence | GitHub ⓘ | Save and compare |
|---|---|---|---|---|---|---|
| 01 | Developer toolsCredit-based monthly subscriptions | > $10,000MRR · Unspecified $More than 10K MRR disclosed in the July 9, 2026 interview; exact financial cutoff unspecified | Founder disclosure in interviewChecked Oct 20, 2026 | — | ||
| 02 | Browserless Managed browser infrastructure for automation, data extraction and browser-based applications. Researched profile |
Developer toolsUsage-based cloud subscriptions + enterprise licensing | ≈ $3,500,000ARR · Unspecified $Approximate ARR stated during the interview published March 5, 2026; recording and measurement dates unspecified | Founder disclosure in interviewChecked Oct 19, 2026 | — | |
| 03 | Developer toolsOne-time software license purchases | ≈ $5,000Monthly revenue · Unspecified $Monthly amount reported in the February 5, 2026 founder interview; exact measurement cutoff unstated | Founder disclosureChecked Oct 20, 2026 | — | ||
| 04 | EmailEngine A self-hosted gateway that exposes mailbox access through a common REST API. Researched profile |
Developer toolsSelf-hosted software subscription + enterprise license | ≈ $13,000MRR · Unspecified $Current MRR stated in the interview published January 24, 2026; measurement date unspecified | Founder disclosure in interviewChecked Oct 19, 2026 | — | |
| 05 | Healthchecks.io Alerts when a scheduled job or backup fails to check in on time. Researched profileOpen source |
Developer toolsOpen source + hosting | $26,000MRR · USDOfficial MRR snapshot updated October 2, 2026 | Company disclosureChecked Oct 19, 2026 | — | |
| 06 | Developer toolsUsage-based | > $1,000,000ARR · USDhistorical milestone nine months after 2021 public launch | Company/founder self-disclosureChecked Oct 18, 2026 | — | ||
| 07 | Developer toolsCredit-based API access through subscriptions and pay-as-you-go purchases | > $15,000Monthly revenue · Unspecified $Gross revenue for 'last month' in the July 7, 2026 interview; the financial month and cutoff are not explicitly dated | Founder disclosure in interviewChecked Oct 20, 2026 | — | ||
| 08 | Polotno An embeddable visual editor SDK and rendering tools for software products. Researched profile |
Developer toolsSDK subscription + enterprise licensing | ≈ $60,000MRR · Unspecified $Current MRR stated in the interview published September 29, 2026; measurement date unspecified | Founder disclosure in interviewChecked Oct 19, 2026 | — | |
| 09 | PostPeer A unified API for connecting social accounts, scheduling content and checking publication results. Researched profile |
Developer toolsUsage-based subscriptions + one-time credit packs | ≈ $2,400MRR · Unspecified $Subscription MRR reported in a July 28, 2026 interview; measurement day unspecified | Founder disclosure in interviewChecked Oct 19, 2026 | — | |
| 10 | pre.dev Plan, build and verify software through a browser or terminal coding agent. Researched profile |
Developer toolsFreemium, credit-based subscriptions and custom enterprise plans | ≈ $500,000ARR · Unspecified $500K ARR reported in the March 12, 2026 interview; exact financial cutoff unspecified | Founder disclosure in interviewChecked Oct 20, 2026 | — | |
| 11 | Developer toolsAPI subscription | $1,000,000ARR · Unspecified $Historical ARR milestone reached November 2021 | Founder disclosureChecked Oct 19, 2026 | — | ||
| 12 | ScreenshotOne A screenshot API that handles browser rendering and capture options. Researched profile |
Developer toolsAPI subscription + usage | $200,000ARR · Unspecified $Historical ARR milestone reported April 2025 | Founder disclosureChecked Oct 19, 2026 | — | |
| 13 | ShipFast A paid web-app starter that packages common launch infrastructure for developers. Researched profile |
Developer toolsPaid license | ≈ $46,400Monthly revenue · Unspecified $October 2024 | Founder disclosureChecked Oct 19, 2026 | — | |
| 14 | SocialKit An API that turns supported social media URLs into structured content and metrics. Researched profile |
Developer toolsUsage-based subscriptions + one-time credit packs | ≈ $2,800MRR · Unspecified $Subscription MRR reported in a July 28, 2026 interview; measurement day unspecified | Founder disclosure in interviewChecked Oct 19, 2026 | — | |
| 15 | Superpower (ChatGPT + Daily) A ChatGPT workflow extension and associated AI newsletter business. Researched profile |
Developer toolsFreemium subscriptions plus newsletter sponsorships across the founder's business | ≥ $10,000MRR · Unspecified $Combined extension-and-newsletter business described as 5-figure MRR in the July 8, 2026 interview; exact financial cutoff unspecified | Founder disclosure in interviewChecked Oct 20, 2026 | — | |
| 16 | Zernio A unified API for connecting accounts and adding social publishing, messaging and related marketing functions. Researched profile |
Developer toolsUsage-based connected-account billing + metered services | > $1,000,000ARR · Unspecified $Founder said the product crossed 1M ARR about a month before the interview published April 30, 2026; exact milestone date unspecified | Founder disclosure in interviewChecked Oct 19, 2026 | — |
Figures are source disclosures, not audited by MRRTrace. Different metrics, currencies and periods are not directly comparable. Read the source policy →
FROM EVIDENCE TO AN EXPERIMENT
Use the case studies to identify a customer, a pricing assumption and a small test.