Lemon Labs — Permanent Research Upgrades
Lemon Labs provides research-based permanent upgrades that persist across all Ascends. The 5th income source and key to long-term scaling.
Last updated: May 31, 2026
Overview
Lemon Labs is the 5th income source in Sell Lemons and introduces a permanent upgrade system. Unlike other income sources that reset with each Ascend, Labs upgrades persist forever — making them the single most important long-term investment for dedicated players. The Labs introduce sci-fi themed research facilities that fundamentally change your income scaling across all sources.
Key Permanent Upgrades
These permanent upgrades persist across all Ascends:
Base Income Research
Permanently increases base income from all sources. The foundation of long-term scaling — invest here first for maximum compound effect.
Cost Reduction Research
Permanently reduces upgrade costs across all income sources. Makes every Ascend cycle more efficient, accelerating your entire progression.
Research Speed
Improves the rate of Labs upgrades themselves. Faster research means quicker permanent gains — invest after Base Income and Cost Reduction.
Badge — Advanced Lemons
Advanced Lemons
14.5% earn rateBuy Lemon Labs — the 5th income source with permanent research upgrades.
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Tips
Ensure all earlier income sources (Stand, Dash, Depot, Trading) are automated before investing heavily in Labs.
Some Labs upgrades are hidden behind decoration purchases. Check for hidden gates in the Labs area.
After Labs is well-established, Lemon Robotics becomes accessible — full automation with robotic workers.