How to evaluate SaaS solutions: a buyer's checklist and scoring template

You have three SaaS vendors on a shortlist, three polished demos behind you and a decision due before the budget closes. Every vendor said yes to every question. You need a way to compare them on evidence rather than on the best presentation. Evaluating SaaS solutions comes down to six questions, answered with documents, and a scoring table that weighs them in the order that matters to you.

The cost of a wrong choice is often not the subscription. It is the migration, the training and the year spent working around a gap nobody tested. This guide gives you the six areas, a checklist to tick and a scoring template with the arithmetic shown. If SaaS itself is new to you, start with What is SaaS?.

Evaluating a vendor in plain terms

Think of it like buying a used car. The seller’s description is the demo. You still check the service history, take it for a drive on your own route, look underneath and ask what it costs to insure. Then you compare two cars on the same list, not on how friendly the sellers were.

A SaaS evaluation does the same. The service history is the vendor’s security evidence. The test drive is a trial with your own data. The insurance quote is the full contract price over the term. And the list is a scoring table you write before the first demo, so the demos cannot rewrite it.

The six areas to check

1. Requirements fit. Write the 5 to 10 tasks the tool must do, in your words, before you see any demo. Ask each vendor to show those tasks, in that order, with your sample data.
2. Security evidence. Ask for documents, not answers. The common ones are a SOC 2 report, an ISO/IEC 27001 certificate and a completed security questionnaire. SOC 2 is an audit report, issued by a CPA firm, against criteria the AICPA lists as “Security, Availability, Processing Integrity, Confidentiality, or Privacy” (AICPA SOC). The Cloud Security Alliance publishes a standard questionnaire, the CAIQ, a set of “Yes/No questions” mapped to its Cloud Controls Matrix (CSA CAIQ v4.1.0). How to read a certificate’s scope and dates is covered in ISO/IEC 27017 explained.
3. Pricing and contract. Get the total price for your expected seats or usage over the full term, including onboarding fees, add-ons and the renewal increase. Read the clauses on auto-renewal, seat reductions and price changes.
4. Integrations. Confirm which plan includes single sign-on (SSO), user provisioning and API access. Ask for the API documentation, and have your developer read it.
5. Data portability and exit. Ask how you export all your data, in which format, and how long the vendor keeps it after the contract ends. Then run an export during the trial.
6. References. Ask for two customers of your size and industry, and call them. Ask what broke in the first six months and how support handled it.

Checklist

• Requirements list written and shared with every vendor before the demos.
• Each vendor showed every required task with your sample data.
• SOC 2 report received, its period and scope read, exceptions noted.
• ISO/IEC 27001 certificate received, scope and expiry date checked.
• Security questionnaire (the vendor’s own or the CSA CAIQ) completed and reviewed.
• Three-year total price calculated for the seat count you expect in year three.
• Auto-renewal notice period, renewal price cap and seat-reduction terms found in the contract.
• SSO, provisioning and API access confirmed on the plan you will buy.
• Full data export run during the trial and opened in another tool.
• Two references called, and their answers written down.
• Scoring table filled in by at least two people, separately, before discussing.

Worked example: a weighted scoring table

A weighted score turns six areas into one number you can defend. You choose the weights before the demos, score each vendor from 1 (poor) to 5 (strong) in each area, multiply, and add.

Example: a labeled hypothetical. A 50-person team compares two vendors. Vendor A costs $20 per user per month and Vendor B costs $28. Over a year, that is 50 x $20 x 12 = $12,000 for A and 50 x $28 x 12 = $16,800 for B, a difference of $4,800. The team set the weights below before the first demo.

Area (weight)	Vendor A score	A weighted	Vendor B score	B weighted
Requirements fit (30%)	4	0.30 x 4 = 1.20	4	0.30 x 4 = 1.20
Security evidence (25%)	3	0.25 x 3 = 0.75	5	0.25 x 5 = 1.25
Price and contract (20%)	5	0.20 x 5 = 1.00	3	0.20 x 3 = 0.60
Integrations (15%)	3	0.15 x 3 = 0.45	4	0.15 x 4 = 0.60
Data exit (10%)	2	0.10 x 2 = 0.20	4	0.10 x 4 = 0.40
Total (100%)		3.60		4.05

The weights add up to 100%: 30 + 25 + 20 + 15 + 10. References are not scored here; they confirm or correct the other scores.

Vendor A wins on price by $4,800 a year and still loses, 3.60 against 4.05. The gap comes from security evidence and data exit, the two areas that are hardest to fix after signing. Now the team can test the result. Is $4,800 a year worth a weaker security record and a harder exit? Writing the question that way is the point of the table.

Copy the template, keep the weights fixed once the demos start, and have two people score separately. If their scores differ by two points or more in one area, that area needs another look.

Common mistakes

1. Writing requirements after the demos. The best demo sets the list, and the list then favors that vendor. Why it happens: demos are booked before anyone has time to write. Instead: write the tasks first and send them to every vendor.
2. Accepting a questionnaire answer instead of evidence. A “yes” in a sales call is not an audit report. Why it happens: asking for documents feels confrontational. Instead: ask for the SOC 2 report or certificate, and read its scope and dates.
3. Comparing first-year prices only. Seat growth, add-ons and renewal increases change the total. Why it happens: quotes show year one. Instead: calculate the full term at the seat count you expect at the end, as the checklist says.
4. Never testing the exit. You find out how hard the export is on the day you leave. Why it happens: nobody plans to leave on day one. Instead: run a full export during the trial and give data exit a weight in the table.

For how per-seat and usage prices are built, see SaaS pricing models. For a worked comparison of one category, see CRM SaaS.

Sources

• AICPA and CIMA, SOC suite of services, checked October 2026.
• Cloud Security Alliance, STAR Level 1: Security Questionnaire (CAIQ v4.1.0), checked October 2026.

In three sentences

Evaluate a SaaS vendor on six areas, requirements fit, security evidence, price and contract, integrations, data exit and references, each backed by a document or a test. Set the weights before the demos and score each vendor from 1 to 5; in the example, Vendor B scores 4.05 against 3.60 despite costing $4,800 more a year. Ask for reports rather than answers, price the whole term and run a full export during the trial, so the decision rests on evidence you can show.