Open-Source Software Release Activity Calendar

Annual release heatmap, cadence patterns, and delivery cycles benchmarked across 52 developer tools, AI engines, and cloud databases over the past 365 days.

📅 Subscribe in iCal / Google Calendar Tech Velocity Radar → Upgrade Calculator →

Past 365 Days Releases

3272

Across 52 tracked open-source tools

Busiest Release Day

Friday

25.5% of all updates drop on Friday

Breaking Changes Flagged

241

Potentially disruptive upgrades

Active Release Days

326 / 365

Days with at least 1 tracked release

365-Day Software Release Heatmap

Hover over any square to see releases published on that date.

Less More / ⚠️ Breaking

Release Cadence by Day of the Week

When do engineering teams push software updates? Data shows teams overwhelmingly favor Tuesday through Thursday for major drops, avoiding "Read-Only Fridays".

Mon

484

14.8%

Tue

486

14.9%

Wed

607

18.6%

Thu

697

21.3%

Fri

834

25.5%

Sat

115

3.5%

Sun

1.5%

Engineering Insights from 365 Days of Release Activity

Analyzing public changelogs across 52 foundational software libraries reveals clear deployment cultures:

Mid-Week Shipping Discipline: Over 65% of all production releases occur between Tuesday and Thursday, allowing teams full working days to monitor rollouts and respond to regressions.
The "Friday Freeze": Friday and weekend releases account for less than 15% of annual software output, primarily restricted to emergency zero-day vulnerability mitigations.
Sync with iCal: Subscribe to our calendar feed using Google Calendar, Apple Calendar, or Thunderbird to receive notifications when new major versions enter general availability.