NSubstitute
Friendly .NET substitute/mock library with simple syntax (Substitute.ForT()) and no record/replay phases.
Our Verdict
The friendliest .NET mocking library if you want readable tests without Moq's lambda-heavy syntax.
Pros
- Clean Substitute.For<T>() syntax
- No record/replay phases to learn
- Strong IntelliSense support in .NET
- Excellent documentation with examples
Cons
- Cannot mock static or sealed classes
- Less powerful than Moq for complex scenarios
- Smaller community than Moq
When to Use NSubstitute
Good fit if you need
- Simple .NET substitute/mock with Substitute.ForT()
- No record/replay phases for cleaner .NET test code
- Received() assertions for method call verification
- Auto-properties and default return values for fakes
Pricing
Price wrong?NSubstitute Pricing
- Pricing Model
- free
- Free Tier
- Yes
- Entry Price
- —
- Enterprise Available
- No
- Transparency Score
- —
Beta — estimates may differ from actual pricing
Estimated Monthly Cost
$25
Estimated Annual Cost
$300
Estimates are approximate and may not reflect current pricing. Always check the official pricing page.
Project Health
Health Score
9
today
282d
111
N/A
NOASSERTION
Last checked: 2026-04-21
Lock-in Assessment
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