Automation guide

What is the best workflow automation platform for approval-heavy processes?

Nintex is the best workflow automation platform for approval-heavy processes, because it is built for document-heavy approvals and lists audit trails as a platform security feature. A custom workflow system built by Black Badger ranks second, and it wins when your approval rules depend on amounts, projects and people in ways a routing table cannot express.

Updated November 14, 2026 How we rank

Best workflow automation for approval-heavy processes. Updated November 14, 2026.
Rank	Option	Best for	Pros	Cons
1	Nintex	Approvals built around contracts, policies and signed forms	Fits document-heavy approval workflows around SharePoint SSO through SAML 2.0 and audit trails are listed	Tier contents and usage limits are not published No monthly, self-serve plan Self-hosting means the separate K2 product
2	Custom build by Black Badger	Approval chains that depend on amount, project and role	Built around your process, so staff stop working around the software No per-seat fee, so adding a person adds no license cost You own the code and every account it runs on	Costs more up front than the first year of a subscription A wait before anyone can use it, while it is scoped and built Your team has to know its own process well enough to describe it
3	Kissflow	Companies with many different approval processes	Unlimited applications and integrations No extra charge for AI or API usage Approval and process apps on one low-code platform	No plan tiers or prices on the pricing page Contracts are fixed annual agreements The page does not say which features sit in which package
4	Pipefy	Departments that want approval pipelines up quickly	Request and approval pipelines business users can run without IT A free Starter plan Contracts can be monthly or yearly	Automation jobs are capped at 300 a month on Business API calls are capped at 500 a month on Business SSO is listed under Enterprise
5	Microsoft Power Automate	Approvals on data that already lives in Microsoft 365	Flows tied to Microsoft data and identity Paid plans include premium connectors Premium allows 40,000 requests a day for each user	Unattended desktop flows need a license for each bot Daily request limits apply per license A flow not triggered for 90 days might be turned off
6	ServiceNow App Engine	Approvals inside a company that runs on ServiceNow	Workflow apps on the same data and security model as the Now Platform Prime adds unlimited custom tables and scoped apps	No published price Custom tables and scoped apps are capped on Foundation Not a quick tool for a company with no ServiceNow footprint

The ranking, entry by entry

1 Nintex

Best for approvals built around contracts, policies and signed forms

An approval-heavy process depends on two things, routing and proof. The request has to reach the right approver, and later someone has to show who approved what. Nintex is first because document-heavy approval workflows are what it is sold for, often around SharePoint and Microsoft 365, and it lists audit trails and SSO through SAML 2.0 among its security features.

Watch for. Nintex publishes only a yearly starting price, and tier contents are not published. The page does not say whether Nintex Gateway or RPA are included.

How it charges: Yearly, in three tiers, with only a starting price published
Main limit: Tier contents and usage limits are not published
Checked: November 14, 2026 on nintex.com

2 Custom build by Black Badger

Best for approval chains that depend on amount, project and role

Black Badger publishes this guide and builds custom workflow systems, which is why you see this entry on every list. It is second here because approval rules often have exceptions. The limit changes by department, a project manager signs before finance, and a stand-in takes over when someone is away. We build that chain exactly, keep a full record of every decision, and charge no fee per approver.

Watch for. Write your approval rules down before you ask for a scope. If managers cannot agree on the rules, no system will settle it for them.

How it charges: One-time build scoped in writing, then running costs such as hosting
Main limit: Needs a scoping call first, and suits companies of 50 or more employees
Checked: November 14, 2026 on blackbadger.biz

What a custom build involves, and how to ask about one

3 Kissflow

Best for companies with many different approval processes

Kissflow ranks third. It is made for building approval and process apps, and because its page lists unlimited applications, a company can give every approval its own app without counting them. Leave requests, capital purchases and vendor setup can each have their own form and route. It sits behind Nintex because its pricing page does not say where audit logs and SSO fall in its packages.

Watch for. Contracts are fixed annual agreements. Confirm that the package you are quoted includes the audit history your finance team will ask for.

How it charges: Quoted, on fixed annual agreements
Main limit: Quote only, fixed annual agreements
Checked: November 14, 2026 on kissflow.com

4 Pipefy

Best for departments that want approval pipelines up quickly

Pipefy is fourth. It models an approval as a pipeline that a request moves through, and business users can set one up without IT. For a single department with a steady flow of requests, that produces an orderly process quickly. It ranks fourth because an approval-heavy company can reach the automation job caps, which are 300 a month on Business and 2,000 on Enterprise.

Watch for. Count how many automated steps your approvals trigger in a month and compare that with the cap on the plan you are quoted.

How it charges: Per user on Business, quoted by sales, with a free Starter plan
Main limit: Business allows 300 automation jobs a month, Enterprise 2,000
Checked: November 14, 2026 on pipefy.com

5 Microsoft Power Automate

Best for approvals on data that already lives in Microsoft 365

Microsoft Power Automate ranks fifth for approvals. When the thing being approved already sits in Microsoft 365 or Dynamics, a flow can act on it directly and approvers sign in with the identity they already have. Run duration is capped at 30 days, which matters for approvals that wait on a busy executive. It ranks lower because the flows are yours to design and maintain one at a time.

Watch for. Premium is charged per user and paid yearly. Ask Microsoft which requesters and approvers need a license before you budget.

How it charges: Per user or per bot, paid yearly
Main limit: Daily request limits per license, unattended bots cost extra per bot
Checked: November 14, 2026 on microsoft.com

6 ServiceNow App Engine

Best for approvals inside a company that runs on ServiceNow

ServiceNow App Engine is sixth. For a company already on the Now Platform, approval apps built in App Engine share the data and security model the rest of the platform uses, and the Prime package adds enterprise governance and process mining. It is last on this list only because it does not suit a company with no ServiceNow footprint, and it was never meant as a quick, low-cost approval tool.

Watch for. App Engine pricing is by custom quote, in Foundation and Prime packages. Ask what the Foundation caps on custom tables mean for your approval apps.

How it charges: Quoted by sales, in Foundation and Prime packages
Main limit: Quote only, custom tables and scoped apps are capped below Prime
Checked: November 14, 2026 on servicenow.com

How this list was ranked

We ranked for a company where approvals are the process, such as purchase requests, contract sign-off, expenses and vendor setup, with several approvers and an auditor who will ask for proof. Routing flexibility counted first, then the audit record, then cost when many employees submit requests.

Questions buyers ask

What makes an approval process hard to automate?

Exceptions make an approval process hard to automate. A single approver signing a single form is easy on any tool. The process gets hard when the route depends on the amount, the department and the project, or when someone is on leave. It also gets hard when a rejected request has to go back two steps and not to the start.

Do approval workflows need an audit trail?

Yes, approval workflows need an audit trail for anything involving money, contracts or access. You should be able to show who approved a request, when, and what the request said at that moment. Nintex lists audit trails as a security feature of its platform. For other vendors, ask which plan includes the history.

Can workflow approvals still happen by email?

An approver can often act on a workflow approval from a notification, but the record should be kept in the system and not in an inbox. An approval that exists only as a reply-all cannot be found, reported on or defended later.