A head-to-head comparison of Tenderly and Ethers.js — pricing, the features that actually differ, and which one fits which use case.
Smart contract observability platform for simulation, debugging, monitoring, and alerting in production
The long-dominant, complete JavaScript library for Ethereum
These are the 9 capabilities where the two tools genuinely diverge — the rest of their feature sets overlap.
| Capability | Tenderly | Ethers.js |
|---|---|---|
| Transaction Debugger | Yes | — |
| Simulation Api | Yes | — |
| Production Monitoring | Yes | — |
| Alert System | Yes | — |
| Virtual Testnets | Yes | — |
| Rpc Provider | Yes | — |
| Open Source | No | Yes |
| Multi Chain | Yes | — |
| Team Collaboration | Yes | — |
| Feature | Tenderly | Ethers.js |
|---|---|---|
| Local Node | ✗ | ✗ |
| Transaction Debugger | ✓ | — |
| Simulation Api | ✓ | — |
| Production Monitoring | ✓ | — |
| Alert System | ✓ | — |
| Virtual Testnets | ✓ | — |
| Rpc Provider | ✓ | — |
| Open Source | ✗ | ✓ |
| Multi Chain | ✓ | — |
| Team Collaboration | ✓ | — |
| Mainnet Forking | — | ✗ |
| Language | — | JavaScript / TypeScript |
| Test Framework | — | ✗ |
| Plugin Ecosystem | — | ✓ |
| Debugging | — | ✗ |
| Deployment System | — | ✗ |
| Coverage Reporting | — | ✗ |
| Gas Reporting | — | ✗ |
Both tools are free to use — costs come from network or usage fees.
Tenderly
$39/mo
$390/yr billed annually
Tenderly
$99/mo
$990/yr billed annually
Tenderly
Custom
Ethers.js
Free
Watch out: Free tier limits simulations to 5/month — quickly exhausted in active development.
Watch out: New-project momentum shifted to Viem.
Tenderly edges ahead on our editorial score (4.6/5), but these tools aren’t straight substitutes. Pick Tenderly when visual transaction debugger is the most accessible evm debugging tool available matters most to your workflow; pick Ethers.js when long-dominant, battle-tested library is the priority. The deciding factor is usually the trade-off you can least afford — Tenderly means accepting that free tier limits simulations to 5/month — quickly exhausted in active development, while Ethers.js means new-project momentum shifted to viem.
Tenderly carries the higher editorial rating (4.6/5 vs 4.6/5), but they solve different problems. Tenderly is the stronger pick when you need visual transaction debugger is the most accessible evm debugging tool available. Ethers.js wins when long-dominant, battle-tested library.
Both tools are free to use, with costs coming from network or usage fees rather than subscriptions.
Tenderly's main limitation is that free tier limits simulations to 5/month — quickly exhausted in active development. For Ethers.js, new-project momentum shifted to viem. 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 Tenderly leads on visual transaction debugger is the most accessible evm debugging tool available and Ethers.js on long-dominant, battle-tested library, the two are often complementary rather than mutually exclusive.