Software estimates don't work! Everyone estimates anyway. We're here to help.
A tool for collaborative work effort estimation for software teams.
What is Guestimator?
Guestimator is an online tool designed specifically for software teams to collaboratively produce estimates, per project or per iteration.
It is a smart sheet for improving communication between product and engineering teams. By iteratively updating estimates, teams can make informed decisions on resource allocation and project timelines.
How to estimate with Guestimator?
1. Prepare
- Start from a template
- Break-down work
- Choose estimation method
- Assign estimators
2. Collaborate
- Submit estimates
- Review pending changes
- Track revision history
- Model different scenarios
3. Communicate
- Sign-off final revision
- Produce a proposal
- Share with stakeholders
- Integrate with work management
Why choose Guestimator?
Workflow-Centered
Unlike static spreadsheets, our tool offers a task-focused user experience for every stage of estimation workflow — whether you're breaking down work, submitting estimates, reviewing changes, modeling scenarios, or presenting a proposal to the client.
Reliable Estimation Process
Say goodbye to corrupted formulas and unauthorized edits. Guestimator ensures data integrity by protecting against common pitfalls, so you can trust your effort estimate.
Change Requests and Reviews
In Guestimator, all changes to the estimation sheet must be reviewed and approved. With side-by-side diffs, teams can visualize and discuss proposed updates before applying them. This makes it easy to track the history and understand where the numbers come from.
Scenario Modeling
After estimators submit their numbers, estimation lead can easily model and compare multiple scenarios by altering formulas, adjusting project scope, or overwriting individual numbers — all without losing the initial data.
Interested? Get an Early Access to Guestimator!
Sign up today to be among the first to experience Guestimator. Let us know if you'd like to receive a demo, special offers, or product updates.