78%
Across 340+ predictions spanning 23 accelerator programs
Accuracy by Program
| Program | Predictions | Correct | Accuracy |
|---|---|---|---|
| Y Combinator | 45 | 36 | 80% |
| Techstars (all) | 38 | 30 | 79% |
| ICON Spark | 12 | 10 | 83% |
| 500 Global | 28 | 22 | 79% |
| Plug and Play | 22 | 16 | 73% |
| Others (combined) | 195+ | 151+ | 77% |
Notable Misses
Transparency about our failures is as important as reporting our successes. Here are three notable misses that inform how we continue to improve the model.
NovaTech — YC W25
We predicted NovaTech for YC W25 but they were rejected. We over-indexed on media coverage and underweighted product maturity. NovaTech had strong press but a prototype that wasn't production-ready. This miss led us to increase the weight of customer traction signals relative to media coverage.
Techstars Cybersecurity 2025 Batch
Our Techstars 2025 cybersecurity predictions had only 65% accuracy. Our model struggled with a batch that prioritized go-to-market readiness over technical innovation. The selection committee shifted criteria mid-cycle, favoring sales-ready startups over technically novel ones. We adjusted our program-specific calibration accordingly.
QuantumShield — ICON Spark 2025
We missed QuantumShield for ICON Spark 2025. They had weak public signals but strong internal referrals we couldn't capture. This highlights a fundamental limitation of our public-signal approach: some selection decisions are driven by private relationships and internal dynamics that no external model can see.
Model Improvements
Each miss teaches us something. Since launching in 2024, we have refined the model through three major iterations. Model v2 (January 2025) increased the weight of customer traction and reduced media coverage weight after the NovaTech miss. Model v3 (January 2026) introduced program-specific calibration — separate weight profiles for cybersecurity, general tech, and deep tech accelerators.
Signal Weight Adjustments
Key signal weight changes based on backtesting results:
- Founding Team Depth increased from 15% to 20% after consistently proving the most predictive signal.
- Media Coverage decreased from 8% to 5% after the NovaTech false positive.
- Customer Traction increased from 10% to 12% to better capture product-market fit signals.
- Prior Accelerator Interest added in v2 at 2% after observing cross-program signal correlation.
Frequently Asked Questions
Disclaimer: AcceleratorWatch predictions are based on publicly available signals. Past accuracy does not guarantee future results. Our track record is self-reported and based on our internal methodology for determining a “correct” prediction. Last updated May 10, 2026.