Solo builder & indie SaaS glossary

• Annual recurring revenue (ARR) — ARR is the annualized value of recurring subscription revenue at a point in time.
• Monthly recurring revenue (MRR) — MRR is the normalized monthly value of recurring subscription revenue, excluding one-time charges.
• Statement of work (SOW) — A statement of work defines engagement deliverables, boundaries, responsibilities, timing, acceptance, and payment terms.
• Freemium — Freemium is a model that offers a permanently usable free tier alongside paid plans.
• Change order — A change order is a written amendment that records a change to agreed project scope, schedule, fee, or acceptance criteria.
• Discovery call — A discovery call is a structured conversation used to understand a prospective client’s goal, constraints, decision process, and fit before proposing work.
• Price anchoring — Price anchoring is the effect of a reference price on how a subsequent price is perceived.
• Custom GPT — A custom GPT is a configured version of ChatGPT tailored with instructions, knowledge files, and enabled capabilities for a particular task.
• Keyword density — Keyword density is the share of a text’s words made up by a target keyword or phrase.

See the source-checked statistics library and free tools.