A head-to-head comparison of Slither and Tenderly — pricing, the features that actually differ, and which one fits which use case.
Trail of Bits' open-source static analysis framework for Solidity — catches vulnerabilities before auditors do
Smart contract observability platform for simulation, debugging, monitoring, and alerting in production
These are the 9 capabilities where the two tools genuinely diverge — the rest of their feature sets overlap.
| Capability | Slither | Tenderly |
|---|---|---|
| Static Analysis | Yes | — |
| Language | Solidity | — |
| Test Framework | N/A (analysis tool) | — |
| Plugin Ecosystem | slitherin + custom detectors | — |
| Debugging | No | — |
| Deployment System | N/A | — |
| Open Source | Yes | No |
| Fuzz Testing | No | — |
| Ci Cd Ready | Yes | — |
| Feature | Slither | Tenderly |
|---|---|---|
| Local Node | ✗ | ✗ |
| Static Analysis | ✓ | — |
| Language | Solidity | — |
| Test Framework | N/A (analysis tool) | — |
| Plugin Ecosystem | slitherin + custom detectors | — |
| Debugging | ✗ | — |
| Deployment System | N/A | — |
| Open Source | ✓ | ✗ |
| Fuzz Testing | ✗ | — |
| Ci Cd Ready | ✓ | — |
| Transaction Debugger | — | ✓ |
| Simulation Api | — | ✓ |
| Production Monitoring | — | ✓ |
| Alert System | — | ✓ |
| Virtual Testnets | — | ✓ |
| Rpc Provider | — | ✓ |
| Multi Chain | — | ✓ |
| Team Collaboration | — | ✓ |
Both tools are free to use — costs come from network or usage fees.
Slither
Free
Tenderly
$39/mo
$390/yr billed annually
Tenderly
$99/mo
$990/yr billed annually
Tenderly
Custom
Watch out: False positive rate requires review — not all flagged issues are real vulnerabilities.
Watch out: Free tier limits simulations to 5/month — quickly exhausted in active development.
Slither edges ahead on our editorial score (4.6/5), but these tools aren’t straight substitutes. Pick Slither when 80+ vulnerability detectors catch reentrancy, access control, and overflow issues before deployment matters most to your workflow; pick Tenderly when visual transaction debugger is the most accessible evm debugging tool available is the priority. The deciding factor is usually the trade-off you can least afford — Slither means accepting that false positive rate requires review — not all flagged issues are real vulnerabilities, while Tenderly means free tier limits simulations to 5/month — quickly exhausted in active development.
Slither carries the higher editorial rating (4.6/5 vs 4.6/5), but they solve different problems. Slither is the stronger pick when you need 80+ vulnerability detectors catch reentrancy, access control, and overflow issues before deployment. Tenderly wins when visual transaction debugger is the most accessible evm debugging tool available.
Both tools are free to use, with costs coming from network or usage fees rather than subscriptions.
Slither's main limitation is that false positive rate requires review — not all flagged issues are real vulnerabilities. For Tenderly, free tier limits simulations to 5/month — quickly exhausted in active development. Weigh these against how you actually plan to use the tool.
In most cases yes — many teams run both, using each where it's strongest. Since Slither leads on 80+ vulnerability detectors catch reentrancy, access control, and overflow issues before deployment and Tenderly on visual transaction debugger is the most accessible evm debugging tool available, the two are often complementary rather than mutually exclusive.