Best API Tools in 2026
Toolradar data: we track 445 api tools tools, 334 of them with a free tier (75%), and 357 entered our catalog during 2026. 215 clear our editorial bar.
Toolradar data: we track 445 api tools tools, 334 of them with a free tier (75%), and 357 entered our catalog during 2026. 215 clear our editorial bar.
This guide covers the 12 that score highest, what separates them, and where each free tier stops. Scores are ours; ratings and review counts come from third-party review platforms.
Quick comparison
| Tool | Free tier | Rating | What it does |
|---|---|---|---|
| OpenAI API | No | 4.6 | Programmatic access to OpenAI's full model lineup: GPT-5.5, o3 |
| Stripe | No | 4.5 | Payment infrastructure for the internet |
| OpenAI Platform | No | 4.6 | API access to powerful AI models |
| OpenTelemetry | Yes | 1 | Observability framework for cloud-native software |
| Supabase | Yes | 4.7 | Open source Firebase alternative |
| Postman | Yes | 4.7 | API platform for building and using APIs |
| ElevenLabs | Yes | 4.6 | Generate lifelike AI voices in 29 languages, clone voices, and |
| Anthropic API | No | 4.5 | API access to Claude for building AI applications |
| Steampipe | Yes | 4.6 | Dynamically query APIs, code, and cloud resources with SQL for |
| Contentful | Yes | 4.3 | Manage and deliver digital content across all channels via API |
The picks
OpenAI API
Programmatic access to OpenAI's full model lineup: GPT-5.5, o3. Editorial score 95, paid only, rated 4.6 across 1960 third-party reviews.
Full profile, pricing and alternatives
Stripe
Payment infrastructure for the internet. Editorial score 94, paid only, rated 4.5 across 4471 third-party reviews.
Full profile, pricing and alternatives
OpenAI Platform
API access to powerful AI models. Editorial score 92, paid only, rated 4.6 across 1960 third-party reviews.
Full profile, pricing and alternatives
OpenTelemetry
Observability framework for cloud-native software. Editorial score 90, free tier available, rated 1 across 169 third-party reviews.
Full profile, pricing and alternatives
Supabase
Open source Firebase alternative. Editorial score 90, free tier available, rated 4.7 across 33 third-party reviews.
Full profile, pricing and alternatives
Postman
API platform for building and using APIs. Editorial score 89, free tier available, rated 4.7 across 2287 third-party reviews.
Full profile, pricing and alternatives
ElevenLabs
Generate lifelike AI voices in 29 languages, clone voices, and. Editorial score 89, free tier available, rated 4.6 across 1151 third-party reviews.
Full profile, pricing and alternatives
Anthropic API
API access to Claude for building AI applications. Editorial score 89, paid only, rated 4.5 across 127 third-party reviews.
Full profile, pricing and alternatives
How we picked
Every tool here is published on Toolradar with an editorial score of 74 or above, out of 445 tracked in this category. Ordering follows that score, then third-party review volume, so a tool with one glowing review does not outrank one with a thousand. The figures update as the catalog does.
FAQ
How many api tools tools are there?
We track 445 published api tools tools, of which 215 clear our editorial bar. 357 were added during 2026, which reflects when we indexed them rather than when each vendor launched.
Are there free api tools tools?
Yes, and they dominate: 334 of 445 offer a free tier, 75%. Free usually means a usage cap rather than a feature cap, so the ceiling arrives with volume.
How should I shortlist?
Start from the constraint that will not move: budget, an existing stack you must integrate with, or a compliance requirement. Filter on that first, then compare the two or three that survive. Ranking by feature count leads to the most expensive tool every time.
Related on Toolradar
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Written by
Louis Corneloup
Founder & Editor-in-Chief at Toolradar. Founder & CEO of Dupple, the publisher of 5 industry newsletters reaching 720K+ tech professionals. Reviews B2B software using a public methodology, see /how-we-rate and /editorial-policy.