The short answer
Compare every quote against the same requirement set. Record the exact source for each price, date, inclusion, exclusion, payment term, and assumption. Mark missing information separately from confirmed differences; silence is not agreement.
What to compare
| Area | Questions to answer | Evidence to keep |
|---|---|---|
| Price | Same currency, tax treatment, quantities, discounts and validity period? | Exact total and the lines that define what it includes. |
| Delivery | Committed date or estimate? From order, deposit, approval or another trigger? | Date, lead-time language and dependencies. |
| Scope | Are products, services, quantities and acceptance criteria equivalent? | Line items, statement of work and specifications. |
| Exclusions | What is explicitly outside the quote? What is simply not mentioned? | Exclusion clauses and unanswered requirements. |
| Payment | Deposit, milestones, invoice timing, net terms, late fees? | Payment schedule and conditions. |
| Responsibility | Who handles installation, freight, insurance, permits or support? | Named party and obligation language. |
| Assumptions | What must be true for the price or schedule to hold? | Assumption, dependency and change-control clauses. |
A repeatable workflow
- Write the requirement set before reading the quotes.
- Normalize units, currency and time periods without overwriting the original wording.
- Compare each quote to the requirements and to the other quotes.
- Separate differences, omissions and ambiguities.
- Attach an exact excerpt and source location to every consequential point.
- Ask suppliers to resolve open points in writing, then compare the reply with the quote.
- Recheck the final version before approval.
Independent synthetic test set
This example is synthetic and safe to reuse when testing a comparison workflow.
Source A — purchase terms
Reference SA-204. Supplier Alpha will deliver by October 15, 2026. Northstar will pay each valid invoice within 30 days of receipt (Net 30). Supplier Alpha is responsible for installation. Price is EUR 84,000.
Source B — revised delivery page
Reference SA-204. Delivery is revised to November 2, 2026. Northstar will pay each valid invoice within 45 days of receipt (Net 45). Northstar is responsible for arranging installation. Price remains EUR 84,000.
Answer key
- Delivery differs: October 15, 2026 versus November 2, 2026.
- Payment timing differs: Net 30 versus Net 45.
- Installation responsibility differs: Supplier Alpha versus Northstar.
- Price does not differ: EUR 84,000 in both sources.
Observed Aelipsis result
On 13 September 2026, the synthetic sources above were run through Aelipsis 0.2.1 using Basic on-device analysis. The product returned three material findings: payment terms, delivery date and installation responsibility. This is one reproducible example, not an accuracy score or claim that every variation will be detected. The real result and evidence views are shown on the Aelipsis homepage.
Where tools help—and where judgment remains
A spreadsheet is often best for normalized prices and quantities. A text diff is useful for exact edits. A semantic comparison can help prioritize meaning across different formats. None removes the need to check source language, resolve ambiguity with the supplier, and decide which version controls.