Aviationstack is a scalable REST API for real-time flight tracking, historical flight data, airport info, and global aviation data.
from $49.99/mo
About DriftSignal
DriftSignal is an API contract drift monitoring tool that continuously polls your live API endpoints against their OpenAPI or Swagger specs. It detects violations like missing fields, type mismatches, and undocumented responses, and alerts your team via Slack, email, or webhook — so you can fix issues before customers notice.
Who is DriftSignal for?
Ideal for backend developers, API owners, and platform teams who want to ensure their APIs stay compliant with their documented contracts. It's also valuable for teams integrating with third-party APIs (like Stripe, Twilio, or GitHub) to catch upstream changes early. Not designed for non-technical users or teams without any API specs.
Key features
DriftSignal supports OpenAPI 3.x and Swagger 2.0, polls every 5–60 minutes, and classifies violations by severity (breaking vs. drift vs. warnings). It requires no agents or code changes — just point it at your spec URL. GitLab CI/CD integration and encrypted auth (Bearer tokens, API keys, HTTP Basic) are included.
Use cases
Track internal API conformance, monitor third-party APIs for breaking changes, and block deploys with a CI script when drift is detected. Whether you're reacting to a sudden outage or proactively auditing your API landscape, DriftSignal gives you real-time visibility.
Key features
- OpenAPI/Swagger support — Parses OpenAPI 3.x and Swagger 2.0 specs, resolving all references.
- Continuous polling — Checks endpoints every 5–60 minutes depending on plan, with no agents or sidecars.
- Violation classification — Automatically separates breaking, drift, and warning-level issues.
- Alerting — Sends real-time alerts via Slack, email, webhook, or PagerDuty.
- Third-party API monitoring — Watch APIs you don't own, like Stripe, Twilio, or GitHub.
- CI/CD integration — Drop-in script fails build on breaking violations, works with GitHub Actions or GitLab CI.
- Auth support — Bearer tokens, API keys, and HTTP Basic stored encrypted.
SaaSpartout Score
7.5
/10
Editorial score from our review methodology — not user ratings.
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DriftSignal Pricing
DriftSignal pricing: Start for free. Billing model: Free.
For comparison: the median starting price in Developer Tools is $19.99/month, measured across 301 tools we track. See the full SaaS Pricing Index →
Free Plan
Start for free with basic monitoring — includes limited polling frequency and violations detection to try DriftSignal with your specs.
Pro Plan
Pro plan includes 5-minute polling (the most frequent available) and advanced features like more endpoints and higher limits. Pricing details available on the DriftSignal website.
No credit card required to start — sign up and point DriftSignal at your API spec to monitor immediately.
Frequently asked questions
Is DriftSignal free?
Yes, DriftSignal offers a free plan that lets you start monitoring your APIs. No credit card is required to start.
How much does DriftSignal cost?
DriftSignal starts with a free plan. Paid plans (like Pro) offer more frequent polling (5 minutes) and additional features. Exact pricing is available on the DriftSignal website.
What is DriftSignal used for?
DriftSignal is used to continuously monitor API responses against their OpenAPI specs, detecting any divergence (drift) like missing fields, type mismatches, or undocumented status codes — alerting teams before customers experience failures.
Who is DriftSignal best for?
Best for developers, API platform teams, and organizations with REST APIs that want to ensure contract compliance and avoid unexpected breaking changes. Also useful for teams integrating third-party APIs to monitor upstream changes.
What are top DriftSignal alternatives?
Alternatives include Apiary, Spectral, or open-source tools like OpenAPI Validator, but DriftSignal stands out for its easy setup, no code changes, and third-party API monitoring without agents.
Does DriftSignal support write-method monitoring?
Currently, DriftSignal supports GET (read) endpoints only. Active contract testing and write-method (POST/PUT/DELETE) checks are on the roadmap.
