Short answer: anything above 0 is solid, above +20 is genuinely good, and comparing your expense tool to Apple's +60 is how internal teams end up demoralized by a number that was never calibrated for them.
NPS asks "how likely are you to recommend this?" — a question invented for products people chose. Internal tools start with three structural handicaps:
| Internal-tool NPS | Read it as |
|---|---|
| Below −20 | Active hostility — expect visible workarounds and shadow IT. Treat as an incident. |
| −20 to 0 | The unremarkable middle where most internal software lives. Not a crisis; not a résumé line. |
| 0 to +20 | Good. Users' needs are met and some are enthusiastic. Above the bar for most estates. |
| +20 to +40 | Genuinely strong — worth studying what this team did and copying it. |
| Above +40 | Exceptional for a tool nobody chose. Verify the sample before celebrating (see below). |
Treat these as reading aids, not gospel — the honest truth is that public benchmarks for internal tools barely exist, which is exactly why calibrating against your own portfolio's distribution beats chasing a magazine number. Your best decision-instrument is relative: which tools sit at the top and bottom of your estate, and which direction is each moving?
Most enterprises measure internal satisfaction once a year, in a 40-question omnibus, answered from memory weeks after the frustration happened. That yields a response rate skewed to the aggrieved and the dutiful, a score you can't attribute to any specific release, and a 12-month feedback loop for tools that ship monthly. The alternative that works:
NPS is a difference of proportions, and at internal-tool sample sizes it's noisy: at n=50, the score's margin of error is roughly ±20 points. Rules of thumb: don't quote a score below n≈30; don't compare two tools whose gap is under 15 points; and never celebrate or panic over a single month's movement on a small tool. Pair NPS with continuous star ratings — the volumes are 10–50× higher, which makes the trend line trustworthy at portfolio scale.